6ES7921-3AK20-0AA0 SIEMENS ⍾ 6ES79213AK200AA0

Front connector module with 4x16 pole IDC connector for digital 32 I/O modules of the S7-1500 Potential supply over Screw terminals

Front connector module with 4x16 pole IDC connector for analog 40 pole I/O modules of the S7-1500 Potential supply over Infeed element

Front connector module with flat ribbon Cable connection for digital 32 I/O modules of the S7-300, Power supply over Spring terminals